Gas-engine valve.



F. D. SHEPHERD..

GAS ENGINE VALVE. APPLICATION FILED MAY 4. Isle. q

Patented AIJP. 2, 191&

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F. D. SHEPHERD.

GAS ENGINE VALVE.

APPLiCATlON FILED MAY4,1916.

Patented Apr. 2, 1918.

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D. SHEPHERD,

GAS ENGINE VALVE.

AP':LlCATIOH mun MAY 4, 191a. 1

.Pzstentsd Apr. 2, 1918.

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awmwwto'a To all whom it may concern:

FRANK D. SHEPHERD, OF SALT LAKE CITY, UTAH.

GAS-ENGINE VALVE.

Specification of Letters Patent.

Patented Apr. 2, 1918.

Application filed May 4, 1916. Serial No. 95,356.

Be it known that I, FRANK D. SHEPHERD, a. citizen of the United States, residing at Salt Lake City, in the county of Salt Lake and State of Utah, have invented certain new and useful Improvements in Gas-Engine Valves, of which the following is a specification.

My invention relates to new and useful improvements in gas engine valves.

The object of my invention is to provide a puppet valve for a gas engine which is closed by a spring from above, so that access may be readily had to the valve for its removal as well as providing means where by the spring tension on the valve can be readily adjusted without adjusting the valve and its cam shaft connection.

Another object/of myinvention is to provide a puppet valve of this character which can be applied to engines with one or more cylinders, cast single or in block, and is applicable to all automobile engines of the L- head type and the T-head type with little expense.

A still further object of my invention is to provide a puppet valve of this character which is simple in structure and having certain details of structure and operation hereinafter more fully set forth.

In the accompanying drawings:

Figure 1 is a vertical sectional view of a gas engine showing my improved puppet valve applied and the spring means for normally holding the same closed;

Fig. 2 is a'side elevation of the several parts 'of my improved valve, showing them in their separated relation;

Fig. 3 is a vertical sectional view of a gas engine showing a modified form of valve and spring seating means;

Fig. 4 is a side elevation of a modified form of push rod used for seating the valve;

Fig. 5 is a top plan view of the valve, showing the key receiving slots whereby the valve may be ground without removing it I from its seat; 7

Fig. 6 is a still further modified form of puppet valve and spring seating means;

F 1g. 7 is a modified form of valve adapted to be used in the form shown in Fig. 6;

Fig. 8 is a side elevation of the spring container showing ribs arranged around the same for cooling it.

Referring now to the drawings, 1 represents a cylinder of a gas engine and to which my improved puppet valve is applied. While I have shown and described my'invention as applied to an automobile engine, it will be understood that the same may be as effectively used on any gas engine.

The head of the cylinder is of solid form and provided with a screw-threaded opening 2 directly above the valve seat 3. This opening, as shown, does not intersect the water jacket, but the head is provided with a solid portion through which the threaded opening extends. puppet form and has its stem 5 extending upwardly through the opening in the cylinder, as will be later described. The valve as shown, rests upon the seat 3 and is raise from the seat by a push rod 6 which extends downwardly through a bushing 6' and is connected to the enlarged push rod 9 by a screw connection, whereby the proper adjustment is obtained, so that the valve is raised the proper distance by the cam 10 on the cam shaft 11. The two push rods are locked in their adjusted positions by the two lock nuts 12 and 13, so as to provide for the proper clearance between the cam. The lower end of the push rod bushing 6 is screw-threaded and has a stuffing box or nut 14 screwed thereon and provided with a. packing 15 which forms a ti ht joint with the push rod. The stuffing ox is locked thereon by a lock nut 16 and the stuffing box prevents excess air from being sucked in on the inlet valves and also prevents the escape of exhaust gases on the exhaust.

vided with an opening 20 through which the valve stem 4 extends. The valve stem adjacent its upper end. is provided with a reduced portion 21 which passes through the spring guide head 22. The stem above the guide head is of an angular form, as indicated at 23, for the reception of an instrument, whereby it may be rotated for grinding the valve to its seat. Surrounding and ,resting against the guide head,isa, ,coi1- The valve 4 is of the 28, so that the llOllSlfiL is tightly closed to the engine.

prevent the escape of gas or the exhaust of A guide-head r29-is mounted in the upper end of the housingand engages the lower face of the plug 26. The plug 26 has a screw-threaded opening therethrough and through which is screwed a set-screw 30 which engages the head .29 and is forced downwardly to vary the tension of the spring on the head 22 for more firmly seating the valve. The set-screw 30 is locked in its adjusted position by a loclcnut 31. By this construction, it will be seen that the spring tension on the valve may be adjusted very readily and the adjustment in no way atlects the adjustment of the push rod connection and its cam operating means. The housing 18 is preferably reduced in the center and provided with radial blades for radiating the heat and keeping the housing comparatively cool. This arrangement also allows the ready replacing of the springs without affecting the adjustment cf the push rod connections and also a ready access to the valves for replacing or grinding the same. The housing provided with a flange ion compresses a p citing to'forln a tight joint with the head of the cylinder and prevents leakage or gas and the loss of compression.

in Fig. l, T fasten the cylinder cover 34 on the cylinder by screwing the hollow plug 35 into the top or head of the cylinder and placing a gasket 36 between its lower end and the cylinder. A lo'ck-nut37 is screwed onto the plug and engages the upper end of the cover and gasket placed between the same.

' bined priming cup form, as shown.

InFig. 8, I have shown the cylinder with a removable head of the usual type and the head is provided with the Opening 2 into which the housing 18 is screwed. In this form the housing is constructed in precisely the same manner and the head is constructed like those shown in Fig. 1 of the drawings. Instead of providing the closing plug with a set-screw for moving the upper head downwardly to vary the tension of the spring, I accomplish this change of tension of the spring by inserting washers 37 between the upper head and the lower face of the plum Any desired number of washers may be used to cause the proper tension of the spring on the lower head. I In this form the lower head 38 carries an integral down wardly extending rod 39 which engages the The sparkplug can be of the comnaeneea upper face oi the valve a. The valve 4: has its valve stem ll extending downwardly and on a set-screw i2, which gives the proper clearance when the cam is down, so that the valve will be seated tightly by'the spring, and is adjustable in the push rod 43, which is operated by the cam in the same manner as that shown in Fig. 1 of the drawings.

In Fig. 6 of the drawings, 1 have shown the removable head just the same as shown in F 2; of the drawings except that the housing 18 is castintegral with the head of the cylinder. The springs and the two heads are constructed in precisely the same manner as that shown in Fig. 1 of the drawings, nd like reference numerals indicate like parts. The valve 4; is also constructed in Fig. 6 exactly like that shown in Fig. 1. Inthis form, I have dispensed with the push rod bushingand the push rod it extends downwardly and tried by the push rod operated by the c. .n. The upper end of the push rod engages the lower face of the valve 4 and when pushed upwardly unseats the same.

Fig. 7 is a modified form of valve in which the valve stern and push rod 46 are made integral with the valve, but the operation would be precisely the SMHGHS that shown in Fig. l of the drawings.

From the foregoing description, it will be seen that the va ve shown in. Fig. 6 of the drawings could be used in. any of the structures shown in F 1, 2 and 3. Likewise, the form of valve shown in Fig. 3 used in either Figs. 1 or 2. lhe form of valve shown in 2 could be used on either of the structures shown in Figs. 1 and 3. Hence I have shown. an improved puppet valve which is interchangeable on any of the forms shown in the drawings.

could be Having thus described my invention, what I claim as new and desireto secure by Letters Patent, is:

1.. The combination of a cylinder having; a passage with a valve seat, a valve, means for lifting. the valve from its seat, a gas-tight housing attached to'and projectinQfrornthe cylinder in line with the direction of movement of the valve to and from its seat and situated on the opposite side of the valve from the valve lifting means, said housing having its end toward the valve closed except for a valve stem guiding hole, and having its outer end closed by a removable cap, a valve-stem passing into the housing through said hole and having a spring bearing larger than the stem passing through said hole, and a coil spring situated within said housing and pressing at one end upon said bearing and acting. to hold the valve yieldingly to its seat.

2. The combination of a cylinder having a passage with a valve seat, a valve, means for lifting the valve from its seat, a gas-tight housing attached to and projecting from the cylinder in line with the direction of movement of the valve to and from its seat and situatedon the opposite side of the valve from the valve lifting means, and having air cooling ribs on its exterior, said housing havin its end toward the valve closed except or a valve stem guiding hole and having its outer end closed by a removable cap, a va ve stem passing into the housing through said hole and having a spring bearing larger than the stem passing through said hole, and a coil spring situated within said hearing and acting to-its seat.

3. The combination of a cylinder having a .passagewith a valve seat, a valve, means for lifting the valve from its seat, a gas-tight housing attached to. and projecting from the cylinder in line with the direction of movement of the valve to and from its seat and situated on the o osite side of the valve from the valve li ting means, said housing having its end toward the valve closed except for a valve stem guidingv hole, and having its outer end closed by a removable cap, a valve'stem passing into the housing through said hole and having a spring bearing larger than the stem passing through said hole, a coil spring situated within said housing and pressing at one end upon saidbearing and acting to hold the valve yieldingly to its seat, and an adjustable bearing for the other end of the spring for changing the tension of-the spring.

' 4. The combination of a cylinder having a passage with a valve seat, a valve, means for lifting the valve from its seat, a gas-tight housing attached to and projecting from the cylinder in line with the direction ofmovement of the valve to andfrom its seat and situated on the opposite side of the valve,

from the valve lifting means, said housing having its end toward the valve closed except for a valve stem guiding hole, and having its outer end closed by a removable cap, a valve stem passing into the housing through said hole and having a spring bearing larger than the stem passing through said hole, the valve stem projecting beyond said bearing and having a formation to receive a grinding tool,. and acoil spring situated within said housing and pressing at one end upon said bearing and acting to hold the valve yieldingly to its seat."

5. The combination of a cylinder having a passage with a valve seat, a valve, means for lifting, the valve from its seat, a gastight housing attached to and projecting from the cylinder in line with the direction of movement of the valve to and 'from its seat and situated on the opposite side of the valve from the valve lifting means, said housing having its end toward the .valve closed except for a valve stem guiding hole, and having itsto hold the valve yieldingly ing a form to receive a grindin outer end closed by a removable cap, a valve stem passing into the housing through said hole and having a spring bearing larger than the stem passing through said hole, the valve stem projecting beyond said bearing and having a formation to receive a grinding tool, and a coil spring situated within said housing and pressing at one end upon said bearing and acting to hold the valve yieldingly to its seat, said means for lifting the'valve 03 its seat comprising a ing larger in diameter than said hole, a

valve stem slidably 'fitting said hole and entering the housing chamber and provided with an enlargement forming a spring bearing, and cooling ribs on the exterior of said housing, a movable head in said housing, a coil spring bearing on the head, means carried by the head for holding the valve seated, and means for varying the tension of the spring on the head.

7. The combinationwith a gas engine cylinder, of a puppet valve therein and held seated in a downward direction, a push rod engaging the lower face of the valve and operated by the cam shaft for unseating the valve, a valve stem carried by the valve and extending through the head of the cylinder, a gas tight housing carried by the head of the cylinder and surrounding the valve stem havin its end toward the valve closed except or a stem guiding hole, the housing chamber beyond said head being larger in diameter than said hole, the outer end of said housing having a removable cap and the end of the stem within the housing havtool a coil spring in said housing norma y holding the valve stem in a downward direction with the valve on its seat, and means for coil spring in the housing engaging said head, a removable plug at the outer end of the housing, a guide head situated between the outer end of the spring and said plug, and means for changing the position of said guide head to vary the tension at the spring. 9. The combination with a gas engine cylinder, of a puppet valve therein seated in a downward direction, a push rod extendin downwardly from the valve and operate by the cam shaft from below, a valve stem carried integral with the upper face of the valve and extending upwardly through the head of the cylinder, a gas-tight housing carried by the head of the cylinder and surrounding the valve stem, the said valve stem having a reduced upper'portion, said housing extending to the exterior of the cylinder and having air cooling ribs on its exterior portion, a head fitting on the reduced portion of the valve stem, a spring within the housing and bearing against the head, a second head carried by the housing and bearing on the upper end ofthe spring, a plug screwed in the ,housin and a set-screw passin throu h the plug and engaging the head for forcing the same downwardly for varying the tension of the spring. I

10. The combination with a gas engine cylinder, of a puppet valve therein closed in redness a downward direction, a push rod bushing, a push rod extending upwardly through the bushing and to the lower faceof the valve,

a packing carriedby the push rod bushing for forming a tightjoint with the push rod,-

a housing screwed in the upper end of the cyllnder head above the valve, a valve stem formed integral with the valve and extend in u ,wardlv within the bushin and hava .P a

ing a reduced upper end, a head surrounding the reduced upper end of the valve stem 7 and resting upon the flange formed thereby,

a spring within the housing and resting on V spring and the upper end of the valve stem being of a rectangular shape to receive an instrument for grinding the valve.

In testimony whereof I hereby aflix my signature in the presence of two witnesses.

FRANK n, snnrnnnn. Witnesses;

J. L. HrroHcooK, C. S. JOHNSON. 

